JWT Decoder

encode decodePopular

Decode JSON Web Tokens (JWT) to see their header and payload.

100% Client-Side — Processed privately & locally in your browser.

TOKEN ACTIVEAlg: HS256

Encoded JWT Token

● Header● Payload● Signature

eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCJ9.eyJzdWIiOiIxMjM0NTY3ODkwIiwibmFtZSI6IkpvaG4gRG9lIiwiaWF0IjoxNTE2MjM5MDIyLCJleHAiOjE5MTYyMzkwMjJ9.4z94yS_vR0fV1c_KqT7x7q7r6Fz6W0V8fV1c_KqT7x8

1. Header (Algorithm & Token Type)

{
  "alg": "HS256",
  "typ": "JWT"
}

2. Payload (Claims & Data)

{
  "sub": "1234567890",
  "name": "John Doe",
  "iat": 1516239022,
  "exp": 1916239022
}

Parsed Standard Claims

Algorithm (alg)HS256

Subject (sub)1234567890

Issued At (iat)1/18/2018, 1:30:22 AM

Expires At (exp)9/21/2030, 4:37:02 PM

1Paste your encoded JWT string into the input field.
2The tool will automatically decode and display the Header and Payload JSON.
3Note: Decryption is not possible without the secret key; this tool only decodes.

Frequently Asked Questions

Is my data sent to any server?

No. All processing for this tool occurs directly within your web browser using Web APIs and WebAssembly. Your data never leaves your computer.

Can I use this tool offline?

Once loaded, most utilities remain functional even if your connection drops. DevtUtils is designed to be lightweight and resilient.

Related Utilities

Explore other handy tools in encode decode

Popular

Base64 Encoder/Decoder

Encode text to Base64 format or decode it back to plain text.

encode decode

URL Encoder/Decoder

Safely encode or decode URLs for web use.

encode decode

HTML Entity Encoder

Encode text to HTML entities or decode them back to plain text.

encode decode